I have always been assured that colon cancer is a slow progressing cancer.
The liver mets I don't know about.
I have to be honest, if you have a chance to have a 10 week vacation with your family, personally, I would go for it.
My Mom was off chemo for almost 9 weeks this past late summer/early fall, with little or no progression of the disease.
You need to live your life. No sense of taking all these drugs and extending the time, if you cannot enjoy it.
Have a wonderful time. Relax, grow strong and E N J O Y !!!
The stupid cancer will still be there, when you get back to it!
Best to you
Beth